In my opinion, China had by far the best handling out of any large nation with resources to handle COVID.

We'll see what happens now that they're loosening public health measures with more recent, more mild strains circulating. Every country has different capacity for delivering care but I would expect they still come out in a far better position as it relates to casualties.

I still don't have good data on long COVID by individuals' infection/vaccination history. I could give my opinions based on the data I do have but it wouldn't be popular here. Personally I err on the side of caution with long COVID concerns because its effects will always disproportionately fall on poorer/disadvantaged groups.